The study on the cold resistance and physiology change of root in meadow fescue━alfalfa mixture and monoculture in winter

• Xiao-hui Shen, 
• Cheng Jiang, 
• Ru-lai Li, 
• Jian-dong Li, 
• Hua Zhang, 
• Hai-yan Zheng, 
• Wei Guo, 
• Li Sun, 
• Peng Feng